If you disagreed on how your friend was parenting would you tell her?

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I have a friend from high school, who is actually my only friend at this point. Don't have enough time to make them, or keep them. Anyway she is 2 years older than me, her family lives off the government they don't work and rarely do anything else. She has alway been ridiculous when it comes to guys...she is one of those girls you can tell is just looking for somebody to take care of her. Every boyfriend she has had since high school has been engaged to her within a month. I still am not quite sure how she manages that...but anyways. She has a daughter who just turned one, who she constantly leaves with her mother for days at a time. The guy she is with now is one of my boyfriends friends, so they are over here quite often. They are engaged and are at this point pregnant. She is always telling us how he wants to adopt her other daughter and yadda yadda. We never see her daughter, they never have her. I just don't understand it. I hate being away from my kids for a day much less a week. I just found out today that she smoked pot the other day. I was furious I just didn't and still don't know what to say. She kept saying it won't hurt me, finally my boyfriend looked at her and said its not you we are worried about. I just don't know what to say to her anymore. She acts like being a parent is an inconvinience for her. How would you approach it??